compat/cmsg.h

   1 /*
   2  * Compatibility-layer for CMSG_
   3  */
   4 #ifndef SQUID_COMPAT_CMSG_H
   5 #define SQUID_COMPAT_CMSG_H
   6
   7 // cmsg.h is found through sys/socket.h
   8 #if HAVE_SYS_SOCKET_H
   9 #include <sys/socket.h>
  10 #endif
  11
  12 // WinSock2.h defines these for Windows
  13 #if HAVE_WINSOCK2_H
  14 #include <winsock2.h>
  15 #endif
  16
  17 // sockaddr_un might be in sys/un.h if not pulled in already
  18 #if HAVE_SYS_UN_H
  19 #include <sys/un.h>
  20 #endif
  21
  22 #if !HAVE_CMSGHDR
  23 struct cmsghdr {
  24     unsigned int cmsg_len;
  25     int cmsg_level;
  26     int cmsg_type;
  27     unsigned char cmsg_data[16]; /* dummy */
  28     /* followed by UCHAR cmsg_data[]; */
  29 };
  30 #endif
  31
  32 /* lifted off https://metacpan.org/source/SAMPO/Socket-PassAccessRights-0.03/passfd.c */
  33 #ifndef CMSG_DATA
  34 # define CMSG_DATA(cmsg) ((cmsg)->cmsg_data)
  35 #endif
  36
  37 #ifndef CMSG_NXTHDR
  38 # define CMSG_NXTHDR(mhdr, cmsg) __cmsg_nxthdr (mhdr, cmsg)
  39 #endif
  40
  41 #ifndef CMSG_FIRSTHDR
  42 # define CMSG_FIRSTHDR(mhdr) \
  43   ((size_t) (mhdr)->msg_controllen >= sizeof (struct cmsghdr)        \
  44    ? (struct cmsghdr *) (mhdr)->msg_control : (struct cmsghdr *) NULL)
  45 #endif
  46
  47 #ifndef CMSG_ALIGN
  48 # define CMSG_ALIGN(len) (((len) + sizeof (size_t) - 1) \
  49              & ~(sizeof (size_t) - 1))
  50 #endif
  51
  52 #ifndef CMSG_SPACE
  53 # define CMSG_SPACE(len) (CMSG_ALIGN (len) \
  54              + CMSG_ALIGN (sizeof (struct cmsghdr)))
  55 #undef HAVE_CONSTANT_CMSG_SPACE
  56 #define HAVE_CONSTANT_CMSG_SPACE 1
  57 #endif
  58
  59 #ifndef CMSG_LEN
  60 # define CMSG_LEN(len)   (CMSG_ALIGN (sizeof (struct cmsghdr)) + (len))
  61 #endif
  62
  63 #if !HAVE_IOVEC
  64 struct iovec {
  65     void *iov_base;
  66     size_t iov_len;
  67 };
  68 #endif
  69
  70 #if !HAVE_MSGHDR
  71 struct msghdr {
  72     void *msg_name;             /* Address to send to/receive from.  */
  73     socklen_t msg_namelen;      /* Length of address data.  */
  74
  75     struct iovec *msg_iov;      /* Vector of data to send/receive into.  */
  76     size_t msg_iovlen;          /* Number of elements in the vector.  */
  77
  78     void *msg_control;          /* Ancillary data (eg BSD filedesc passing). */
  79     size_t msg_controllen;      /* Ancillary data buffer length.
  80                                    !! The type should be socklen_t but the
  81                                    definition of the kernel is incompatible
  82                                    with this.  */
  83
  84     int msg_flags;              /* Flags on received message.  */
  85 };
  86 #endif
  87
  88 #if !HAVE_SOCKADDR_UN
  89 struct sockaddr_un {
  90     char sun_family;
  91     char sun_path[256];   /* pathname */
  92 };
  93 #endif
  94
  95 #ifndef SUN_LEN
  96 # define SUN_LEN(ptr) ((size_t) (((struct sockaddr_un *) 0)->sun_path)        \
  97         + strlen ((ptr)->sun_path))
  98 #endif
  99
 100 #ifndef SCM_RIGHTS
 101 #define SCM_RIGHTS 1
 102 #endif
 103 #ifndef SCM_CREDENTIALS
 104 #define SCM_CREDENTIALS 2
 105 #endif
 106 #ifndef SCM_SECURITY
 107 #define SCM_SECURITY 3
 108 #endif
 109
 110 #ifndef AF_LOCAL
 111 #define AF_LOCAL 1
 112 #endif
 113
 114 // CMSG_SPACE is not constant on some systems (in particular Max OS X),
 115 // provide a replacement that can be used at build time in that case
 116 // NP: this must go below our replacement definitions.
 117
 118 #if HAVE_CONSTANT_CMSG_SPACE
 119 #define SQUID_CMSG_SPACE CMSG_SPACE
 120 #else
 121 // add 16 bytes for header and data alignment
 122 #define SQUID_CMSG_SPACE(len) (sizeof(struct cmsghdr) + (len) + 16)
 123 #endif
 124
 125 #endif /* SQUID_COMPAT_CMSG_H */